Conclusion
-For lowlands you will find the best exchange is with the Stronghold of Shadow of any level at 31,680,000 gold per crestplate.
-For Highlands the best return is with selling level 1 Arboreal Dungeon(Defense building specific to highland) at 320,000,000 gold per crestplate.
-For Hoarfrost it is best to sell any of the hoarfrost buildings at level 1-5 at 1,000,000,000 gold per crestplate.
-For Abyssal selling a level 1 of any of the abyssal set will net the best return at 1,600,000,000 gold per crestplate.

Moderator

Neat thread I added a breakdown of sell price and advice in the first reply under my original post a few weeks ago (the usual "reserved" slot--first time I've actually used one of mine). I haven't had a chance to look at your spreadsheets yet, I'm looking forward to them

Neat thread I added a breakdown of sell price and advice in the first reply under my original post a few weeks ago (the usual "reserved" slot--first time I've actually used one of mine). I haven't had a chance to look at your spreadsheets yet, I'm looking forward to them

Click to expand...

Mostly just a jumbled mess of finding sale value and total tokens used per level. But I am going to try and organize it at a later date.